Method of indicating a portable unit of a cordless telephone ins

Details Method of indicating a portable unit of a cordless telephone ins Method of indicating a portable unit of a cordless telephone ins

1995-05-26

1997-07-01

Kuntz, Curtis

Telecommunications

Radiotelephone system

Out-of-range indication

379 1, 379 27, 379 29, 379 32, 379 33, 455 381, 455462, H04M 124, H04M 322, H04M 1100, H04Q 700

Patent

active

056446209

ABSTRACT:
A cordless telephone instrument is improved in that, even when a portable unit is not in use, it can be determined and notified to the user whether the portable unit is inside or outside of an operational area of the portable unit. In portable unit 2, portable unit timer 28 counts a predetermined first reference time and outputs a time-out signal for each first reference time. Every time the time-out signal is outputted, a registration signal is transmitted from portable unit radio circuit 21 toward a fixed unit. When the registration signal is received by fixed unit radio section 12, fixed unit 1 transmits a response signal toward portable unit 2. Portable unit 2 continuously operates to receive a response signal. However, when no response signal is detected within a counting time of portable unit timer 28, operational area out alarm generation section 27 is activated under the control of portable unit control circuit 24 to perform an operation of notifying that portable unit 2 is outside of the operational area.

REFERENCES:
patent: 4853951 (1989-08-01), Bauer
patent: 4930149 (1990-05-01), Matsushima
patent: 4939766 (1990-07-01), Umemoto
patent: 4996715 (1991-02-01), Marui
patent: 5086507 (1992-02-01), Mela
patent: 5373548 (1994-12-01), McCarthy
Patent Abstracts of Japan, vol. 014, No. 145 (E-0905), 19 Mar. 1990 & JP-A-02 007731 (Sharp Corp.).

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